LG KE600 Service Manual - Page 104
Checking VCTCXO Circuit, VCTCXO Circuit Diagram
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5. Trouble shooting 5.15.3 Checking VCTCXO Circuit Checking Points Checking Flow X601 Pin 3: 26MHz Figure 4. VCTCXO Is the waveform of Pin3 similar to Yes Is the waveform of Pin4 similar to Pin : 2.7V Yes VCTCXO Circuit is OK. See next page to check PLL Circuit. No Replace X601 No Checking U201 (PMIC) VCTCXO Circuit Diagram 2V7_VCXO 100p R620 0 C641 C632 NA 1u 26MHz 4 VCC GND 2 3 OUT VCONT 1 X601 Waveform Pin 4 Pin 3 Figure 5. VCTCXO Figure 6. VCTCXO Waveform - 105 -
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5. Trouble shooting
- 105 -
5.15.3 Checking VCTCXO Circuit
Checking Points
Checking Flow
Waveform
Figure 5. VCTCXO
Figure 6. VCTCXO Waveform
C641
NA
2V7_VCXO
C632
1u
100p
0
R620
GND
2
OUT
3
4
VCC
1
VCONT
X601
26MHz
Pin 4
Pin 3
VCTCXO Circuit Diagram
Is the waveform
of Pin3 similar to
Is the waveform
of Pin4 similar to
Replace X601
Checking
U201
(PMIC)
Yes
No
No
Yes
VCTCXO Circuit is OK.
See next page to check
PLL Circuit.
Pin : 2.7V
Pin 3:
26MHz
X601
Figure 4. VCTCXO